First, I had a phone screen where we discussed several questions about Objective-C: memory management, KVO, KVC, Core Data.

If you pass this interview, they will bring you on-site for a series of interviews (4 for me). Three of them were engineering-related, with whiteboard coding problems.

The current office is pretty crowded and everything looked a little messy, but they told me they are about to move to their new, shiny office, so I expect that to change soon enough.

They asked typical "BS" questions, such as LCS in a binary search tree and in a regular binary tree, and other search-related problems.

Also expect some design/architecture questions.